Hack saw



FIG. 1 is a side elevational view of the hack saw;

FIG. 2 is an elevational view, in perspective, of that side of the hacksaw not shown in FIG. 1;

FIG. 3 is an end elevational view of the hack saw; and

FIG. 4 is a bottom plan view of the hack saw.

The ornamental design for a hack saw, as shown and described.